Some time ago, Tim R. Johnson (tjohnson@s.psych.uiuc.edu) gave a program
for least squares isotonic regression.
> It is using non-negative least squares with an appropriately constructed
> design matrix
> The following function performs isotonic regression using the S-PLUS
> function nnls.fit() for the non-negative least squares fitting. You can also
> snag it from ftp://www.psych.uiuc.edu/pub/share/tjohnson/isoreg.txt.
Perhaps this program may be helpful to you.
Andreas Christmann
----------------------------------------------
A.Christmann@hrz.uni-dortmund.de
Dr. Andreas Christmann
Universitaet Dortmund
Hochschulrechenzentrum
Wissenschaftliche Anwendungen
D-44221 Dortmund
phone (049)-231-755-2763
fax -2731
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